## A hitchhiker’s guide to Hera’s target asteroids Currently speeding through deep space at 12 km/s relative to Earth, ESA’s Hera spacecraft is due to reach its target Dimorphos asteroid this November. But if an astronaut were magically teleported onto the small-car-sized Hera upon arrival, what would they be seeing, and what would it feel like to walk on the asteroid’s surface? To start with, Hera is actually headed for two asteroids rather than one. Dimorphos – at 151 m across about the size of the Great Pyramid of Giza – is actually orbiting around the mountain-sized 780-m diameter Didymos…